Filter.



G. M. K-NEUPER.

FILTERl APPLIOATIDN FILED SEPT. 10 v Patented Oct. 25,1910.

WITNESSES y rfirnoluus Ilz-IRS co. WASHINGTON. n. c.

PATENT OFFICE.

GEORGE M. KNEUPR, OF BROOKLYN, NEW YORK.

FILTER.

Specification of Letters Patent.

Patented Oct. 25, 1910.

Applieation fnea september 1o, 1909. serial No. 517,036.

put together and taken apart and in which the maximum amount ofeffective filtering surface is readily available and not likely tobecome clogged and rendered ineffective by gathering impurities. Infilters generally,

as the filtering material gradually becomes coated with such impurities,the tendency of theentering liquid is to find an outlet of leastresistance, usually the point of engagement between the said filteringmaterial and the filter shell. This results in a by-passing ofunfiltered liquid at these points; and it is a further object of myinvention to overcome this disadvantage and to provide a structure whichwill do away with the possibility of this by-passing of unfilteredliquid.

My improved filter is further constructed to prevent the infiowingliquid from impinging directly on the filtering material, thusincreasing the life of the filtering material and securing longer andbetter results than if the liquid impinged against the filteringmaterial throughout a reduced area thereof.

My improved filter further comprises a two-part construction, which maybe readily assembled and locked together without tearing or otherwisedamaging the filtering material itself.

Other objects of my invention will appear from the descriptionhereinafter and the features of novelty will be pointed out in theappended claims.

Reference is to be had to the accompanying drawings in which- Figure 1is a central vertical section of my improved filter; Fig. 2 is a planview of the lower portion thereof; Fig. 3 is an enlarged detail 'crosssection of my improved'structure; and Fig. k4 is a detaill elevation ofthe jf inlet and outlet pipe.

The filter comprises a shell 1 having an internally screw threadedprojection 2 adapted for connection with a faucet or other source ofliquid to be filtered, a ring washer or gasket 3 being located in saidprojection 2 in order to secure a tight joint bey tween the faucet andthe filter at this point. The downwardly projecting flange 1a of theshell 1 converges slightly toward the projection 2.

4 is a tube, the screw threaded upper end 4a of which is adapted to bescrewed into an opening in the upper wall of the shell l so that-whensaid tube is in operative position it will be in axial alinement withthe mouth ofthe faucet or other source from which the liquid to befiltered is secured. The said tube 4 is divided into two compartments bymeans of a central partition 5 and is tapered l in a direction away fromthe projection 2,

the lower end thereof being screw threaded as indicated at 6 for thepurpose to be more fully described hereinafter. At convenient pointsabove the partition 5 the said tube is vprovided with upwardly inclinedslots or `openings 7, while below the partition 5 the said tube isformed with slots 8, which preferably project at substantially rightangles to the axis of said tube.

The lower part of the filter comprises a casing 9 having an upwardlyextending annular fiange 10 to which is secured the perforated plate 11,provided with a central opening 12 through which the tube 4 is adaptedto extend. The opening 12 is of a slightly greater diameter than thediameter of the tube 4 and is provided with inclined walls 12a. A collar13 is secured to the casing9 and projects upwardly into engagement withythe lower face of the perforated plate l1, and is formed with a row ofapertures 14 for the escape of the filtered water.

15 is a swivel nut rotatably secured on the casing 9 and is providedwith a screwthreaded axial opening 16 adapted for engagement with thescrew threaded end 6 of the tube 4. It is to be understood that this nut15 is so secured in position in the casing 9 as to be freely rotatablerelatively thereto without, however, being capable of any other motionrelative to said casing.

17 is a sheet of filtering material carried by the casing 9 andpreferably conforming in shape to the interior of the shell 1 andfurther having a central opening through which the tube 4 in theoperative position of the parts is adapted to extend. 18 is a coilspring surrounding said tube 4 and having its one end in engagement withthe filtering material 17 and its other end abutting against the upperinner face of the shell 1. The filtering material 17 projects 'lolbeyond the flange 10, the reason for which will be more clearly broughtout hereinafter.

In assembling the parts the filtering material is placed over theperforated plate 11 with its central opening in axial alinement with thecollar 13 and with its edges extending beyond the fiange 10 which in theas.- sembled condition of the parts is spaced from the interior surfaceof the fiange 1a. After this has been done the casing 9 is placed withinthe shell 1 and the nut 15 by rotation relatively to the lter casing isengaged with the screw threaded end of the tube 4, so that finally theparts will be firmly clamped together. As the nut 15 is thus rotated,the acasing 9 will be forced up into the shell without, however, beingrotated relatively thereto, and owing to the inclined or convergingsides of the shell 1 the overlapping edges 17a of said filteringmaterial will be turned down and firmly clamped in the annular spacebetween the flange 1a of the shell 1 and the flange 10. At the same timeowing to the inclined portions 12a of the central opening 12, as theparts are screwed together a boss will be formed upon the said filteringmaterial adjacent to said central opening 12 as clearly shown in Fig. 3,so that the filtering material will be firmly clamped between saidinclined portions 12a and the inclined walls of the tube 4. 1n themeantime the coil spring 18 has been compressed. It will thus be seenthat the filtering material is firmly clamped at its outer edges and isalso firmly clamped adjacent to its central opening, so that it isimpossible for any liquid to pass between the filtering material and theshell 1, or between the filtering material and the tube 4, One of themost objectionable features of existing filtering constructions, thatis, by-passing of unfiltered liquid at these points is thus absolutelyavoided. To se cure a tight joint at the point of engagement between theshell 1 and the casing 9, I introduce a gasket or washer 19 between saidparts.

ln operation liquid to be filtered enters the upper end of the tube 4 byway of the projection 2 and passes to the interior of the filter throughthe upwardly inclined slots 7. Owing to the upward inclination of theseslots, the inrushing liquid is directed against the upper wall of theshell and from there gradually reaches the filtering material. By thisconstruction the liquid to be filtered is diffused and does not impingedirectly against the filtering material continun ally at the same point,so that excessive wear of the filtering material, at any single point ofits area is obviated. The life of said material is thus materiallyprolonged and in addition the liquid is brought into contact with thefiltering material throughout, so

erases that the entire area thereof is made use of for filteringpurposes resulting in a more efficient filtering than if a limited areaof said material only were used. The liquid passes through saidfiltering material and through the perforated plate 11 into the chamberformed by the annular flange 10 and finally flows through the apertures14 and through the openings 8 to the interior of the tube 4 and fromthere through the central opening 1G of the nut 15.

My improved filter therefore consists essentially of two separableparts, which are readily disconnected and just as readily put togetheragain without tearing or otherwise injuring the filtering material 17.It will readily be seen that as the parts are connected or disconnected,the only relative movement between said parts is an axial one, the onlyportion thereof which rotates being the nut 15. The filtering materialitself is not rotated during this connecting and disconnectingoperation, so that, as before stated, it is not likely to be torn orinjured as the parts are assembled or separated.

When it is required to insert a new disk of filtering material, it isonly necessary to reverse the rotation of the nut 15 to separate thecasing from the shell, the spiral spring 1S during this operationcausing the filtering material 17 to follow the outward movement of thecasing 4 relatively to the shell 1, until finally the parts aredisengaged. Owing to the pressure exerted by the spring 18, thefiltering material cannot stick in the shell 1, but remains evenlyplaced on the perforated plate 11 and flange 10, from which it mayeasily be removed after the parts have been disengaged without thenecessity for handling it. The spring 1S further tends to press theshell 1 and the casing 4 apart thus aiding in the separation of theseparts and overcoming any tendency to bind which the shell and casing mayhave. By providing the upwardly inclined cuts or slots 7 in the upperportion of the tube 4, the inrushing liquid is directed against the roofof the shell and from there to the sides thereof, and finally reachesthat part of the filtering material first where said material is tightlypacked between the shell and the casing and consequently of a greaterdensity and strength and not likely to be easily worn out. From thispoint the liquid gradually spreads over the entire surface of thefiltering material and through the same to the outlet as hereinabovedescribed. The said filtering material thus suffers no damage by reasonof the impact of the water however great the inrushing force thereof maybe.

Various modifications may be made without departing from the spirit ofmy invention as defined in the claims.

I claim as 'my invention:

l. A filter comprising a casing formed in two sections, means forsecuring said sect-ions together, a sieve located in said casing andprovided with an aperture, a tube ex tending axially of said casingthrough the aperture of said sieve, said 'tube being of less diameterthan the diameter of said aperture, and a sheet of filtering materialarranged on said sieve and to be clamped between the peripheries of theaperture and the tube.

2. A filter comprising a casing formed in two sections, means forsecuring said sections together, a sieve located in said casing andprovided with an aperture having a beveled periphery, a tube extendingaxially of said casing and having a tapered portion projecting throughsaid aperture, said tapered portion being of less diameter than thediameter of said aperture and a sheet of filtering material arranged onsaid sieve and to be clamped between the beveled periphery of theaperture and the tapered portion of' the tube.

3. A fil'ter comprising a casing, a sheet of filtering material locatedin said casing and provided with a central aperture, a tube extendingaxially of said casing through said aperture and divided into an inletand outlet chamber, and means for clamping said filtering material atits periphery and at its central portion adjacent to the aperture.

e. A filter comprising a casing formed in two sections, one of saidsections having an annular flange extending into the other section andspaced therefrom, a sieve supported on said flange provided with acentral aperture, a tube divided into an inlet and an outlet compartmentextending axially of said casing through the said aperture and a sheetof filtering material located on said sieve and arranged to be clampedbetween the flange and the casing and also between the periphery of saidaperture and said tube.

A vfilter comprising a casing formed in two sections, one of saidsections having an annular flange extending into the other section andspaced therefrom, a sieve supported on said flange provided with acentral aperture, a tube divided into an inlet and an outlet compartmentextending axially of said casing through 'the said aperture, a sheet of'filtering material located on said sieve and arranged to be clampedbetween the flange and the casing and also between the peripheryv ofsaid aperture and said tube, and a nut swiveled in one section andarranged to engage said tube to lock the sections together.

6. A filter comprising a casing formed in two detachably connectedsections, a tube extending axially of said casing and divided in'to aninlet and outlet compartment, an apertured collar spaced from andsurrounding said tube adjacent to the outlet, the apertures of saidcollar being out of registry with said outlet, and a sheet of filteringma- 'terial in said casing between the inlet and outlet.

7. A filter comprising a casing formed in two detachably connectedsections, a sheet of filtering material located in said casing andprovided with a central aperture, a tube extending axially of saidcasing 'through said aperture and divided into an inlet and outletchamber, means for clamping said filtering material at its periphery andat its central portion adjacent to 'the aperture and a springsurrounding said tube and engaging the one casing section and the sheetof filtering material respectively and having a tendency to exertpressure in a direction of the axis of said casing.

In testimony whereof I have hereunto set my hand in the presence of vtwoSubscribing witnesses.

GEORGE M. KNEUPER.

Witnesses:

JOHN A'. KEHLENBEGK, G. V. RAsMUssEN.

